array_merge_recursive

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

array_merge_recursive — 递归地合并一个或多个数组

说明

array_merge_recursive(array ...$arrays): array

array_merge_recursive() 将一个或多个数组的单元合并起来，一个数组中的值附加在前一个数组的后面。返回作为结果的数组。

如果输入的数组中有相同的字符串键名，则这些值会被合并到一个数组中去，这将递归下去，因此如果一个值本身是一个数组，本函数将按照相应的条目把它合并为另一个数组。需要注意的是，如果数组具有相同的数值键名，后一个值将不会覆盖原来的值，而是附加到后面。

参数

arrays: 数组变量列表，进行递归合并。

返回值

一个结果数组，其中的值合并自附加的参数。如果未传递参数调用，则会返回一个空 array。

更新日志

版本	说明
7.4.0	允许不传递参数调用，之前的版本中至少需要一个参数。

示例

示例 #1 array_merge_recursive() 例子

<?php
$ar1 = array("color" => array("favorite" => "red"), 5);
$ar2 = array(10, "color" => array("favorite" => "green", "blue"));
$result = array_merge_recursive($ar1, $ar2);
print_r($result);
?>

以上示例会输出：

Array
(
    [color] => Array
        (
            [favorite] => Array
                (
                    [0] => red
                    [1] => green
                )

            [0] => blue
        )

    [0] => 5
    [1] => 10
)

参见

array_merge() - 合并一个或多个数组
array_replace_recursive() - 使用传递的数组递归替换第一个数组的元素

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gabriel dot sobrinho at gmail dot com ¶

16 years ago

I refactored the Daniel's function and I got it:<?php/** * array_merge_recursive does indeed merge arrays, but it converts values with duplicate * keys to arrays rather than overwriting the value in the first array with the duplicate * value in the second array, as array_merge does. I.e., with array_merge_recursive, * this happens (documented behavior): * * array_merge_recursive(array('key' => 'org value'), array('key' => 'new value')); *     => array('key' => array('org value', 'new value')); * * array_merge_recursive_distinct does not change the datatypes of the values in the arrays. * Matching keys' values in the second array overwrite those in the first array, as is the * case with array_merge, i.e.: * * array_merge_recursive_distinct(array('key' => 'org value'), array('key' => 'new value')); *     => array('key' => array('new value')); * * Parameters are passed by reference, though only for performance reasons. They're not * altered by this function. * * @param array $array1 * @param array $array2 * @return array * @author Daniel <daniel (at) danielsmedegaardbuus (dot) dk> * @author Gabriel Sobrinho <gabriel (dot) sobrinho (at) gmail (dot) com> */function array_merge_recursive_distinct ( array &$array1, array &$array2 ){  $merged = $array1;  foreach ( $array2 as $key => &$value )  {    if ( is_array ( $value ) && isset ( $merged [$key] ) && is_array ( $merged [$key] ) )    {      $merged [$key] = array_merge_recursive_distinct ( $merged [$key], $value );    }    else    {      $merged [$key] = $value;    }  }  return $merged;}?>This fix the E_NOTICE when the the first array doesn't have the key and the second array have a value which is a array.